This is why containerized applications are more secure and manageable. Kubernetes containers are isolated from the underlying infrastructure.
How docker and kubernetes work together portable#
Isolating application components made them lightweight, portable between clouds, and increased application manageability. Being very similar to virtualization, it addressed several issues: application manageability, scalability, and fault-tolerance. Once the resources allocation issue was fixed, another solution came along - containerization. Virtualization allowed businesses to add, update, and scale applications without paying for extra servers.
This solved the resource allocation issue since organizations could deploy multiple applications on one server while still keeping them in isolated environments so that the resources spread out.
VMs are complete machines that run all components of applications and their operating system on top of the hardware (see picture above). The solution offered to run Virtual Machines on the server’s CPU. Well, this is what they call - a traditional deployment. Not only is this costly, but also it would take a lot of room to keep all those servers. However, organizations would have to pay multiple times more.
Logically, a perfect solution would be running apps on separate servers. Simply put, when one server ran several applications and took most of the resources, the other would underperform. Thus, the resource allocation issue came up. Defining resource boundaries became an issue as it was just impossible to do it. History of application deploymentĪs you see in the picture above, early on, organizations ran applications on physical servers with an installed operating system on top of them. Check out the table below to see why Kubernetes became so useful.
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